You definitely wouldn't need tracking. I imagine the halo would only require an exposure of 2-8 seconds, depending on the ISO used.
Also given that the exposure requires a short focal length lens, you won't see any trailing for at least 15 seconds on a fixed tripod.
If you wanted to combine two exposures, you'd have to do some careful blending in photoshop to blend the two layers (using selective feathering). Otherwise you could just paste the cutout of the full moon exposure over the top of where it should go in the halo exposure.
The idea is to make it not look too sharp and cutout, ie not too obviously processed.
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